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I'm really interested in using Docker but I'm having trouble understanding how to manage stateful applications, like databases.

• hippiefahrzeug 12y ago
  There are two ways: 1. You run the db and its files inside a container and regularly export a DB dump like so (example for postgres): docker run --volumes-from db -v $(pwd):/backup ubuntu:trusty sh -c "cd /var/lib && tar zcvf /backup/backup.tgz postgresql" (I don't recommend this) 2. You run the db inside a docker container and mount a volume for /var/lib/postgresql into docker. This I find is the best way. the db files remain on your host and you can easily maintain the DB (runtime) and files separately. Adjust to whatever DB you're using.
• discordianfish 12y ago
  I recommend using a data volume container: $ docker run --name db-data -v /var/lib/db busybox true $ docker run --name db-server --volumes-from db-data db-image This way you can remove the db-server container and recreated it with the same command and it will reuse the volume. See also https://docs.docker.com/userguide/dockervolumes/#creating-and-mounting-a-data-volume-container https://docs.docker.com/userguide/dockervolumes/#creating-an...